fn test1(num: &mut i32) {
    *num += 1;
}

pub fn start_test(){
    let mut num: i32 = 100;
    test1(&mut num);

    println!("{}",num);

    let s = String::from("hello");
    println!("Hello {}", s);
    let data = vec![1, 2, 3, 4, 5];
    for i in &data {
        print!("{}", i);
    }
    println!("{}", data[1]);
}
